Midco economite RE4850BA

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Installation and Service Instructions

12 01

8471 24

Printed in U.S.A.

In the United States, Installation must

conform with local codes or, in the absence of local

codes, with Installation of the National Fuel Gas

Code, ANSI Z223.1-latest edition, from the American

National Standard Institute. Further reference should

be made to the recommendation of your fuel supplier.

In Canada, Installation must conform with local

codes or, in the absence of local codes, with

Installation Codes for Gas Burning Appliances and

Equipment, CGA Standard CAN/CGA 1B-149.

Further reference should be made to the

recommendation of your fuel supplier.

WARNING: Additions, changes, conversions,

and service must be performed by an authorized

MIDCO representative, service agency, or the fuel

supplier. Use only MIDCO specified and approved

parts.

INSTALLER: Inform and demonstrate to the user

the correct operation and maintenance of the gas

utilization equipment. Inform the user of the

hazards of storing flammable liquids and vapors in

the vicinity of this gas utilization equipment and

remove such hazards. Affix this manual and

associated literature adjacent to the burner. CODE

COMPLIANCE IS THE SOLE RESPONSIBILITY OF

THE INSTALLER.

USER: Retain this manual for future reference. If

other than routine service or maintenance as

described in this manual and associated literature

is required, contact a qualified service agency. DO

NOT ATTEMPT REPAIRS. An inadvertent service

error could result in a dangerous condition.

Economite

RE4850BA / RE4700BA

RE4400B / RE4400BA

Gas Burners

BURNER MODEL

BILL OF MAT'L

NUMBER

SERIAL CODE #

WIRING DIAGRAM

FOR SERVICE CONTACT:

Name

Address

Phone

Date of Installation

Do not store or use gasoline or other flammable

vapors and liquids in the vicinity of this or any

other appliance.

WHAT TO DO IF YOU SMELL GAS:

? Do not try to light any appliance.

? Do not touch any electrical switch;do not use any

phone in your building.

? Immediately phone your gas supplier from another

building. Follow the gas supplier’s instructions. If

you cannot reach your gas supplier call the fire

department.

Installation and service must be performed by a

qualified installer, service agency or the gas supplier.

The following terms are used to identify hazards, safety precaution of special

notations and have standard meanings throughout this manual. They are printed in all capital letters using a bold type face

as shown below, and preceded by the exclamation mark symbol. When you see the safety alert symbol and one of the

safety information terms as shown below, be aware of the hazard potential.

DANGER: Identifies the most serious hazards which will result in severe personal injury or death.

WARNING: Signifies a hazard that could result in personal injury or death.

CAUTION: Identifies unsafe practices which would result in minor personal injury or product and property damage.

WARNING: If the information in these instructions

is not followed exactly, a fire or explosion may result,

causing property damage, personal injury or death.

Midco International Inc.

4140 West Victoria St. - Chicago, Illinois 60646

tel 773.604.8700 fax 773.604.4070

web www.midco-intl.com e-mail sales@midco-intl.com

Quality Designed for Proven Performance

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This document provides installation and service instructions for the Economite RE4850BA, RE4700BA, RE4400B, and RE4400BA Gas Burners. These burners are designed for various gas utilization equipment, including gravity and forced circulation furnaces and boilers, and are particularly suited for horizontal or downdraft applications as they do not require a draft to maintain a pilot. Their power burner design also makes them suitable for oil burner replacement, as well as rooftop and industrial applications.

Function Description:

The Economite gas burners utilize an intermittent spark-ignited pilot system for reliable ignition. The core function involves a blower motor that provides combustion air, which is then mixed with gas in the pilot system and main burner. An air pressure switch ensures that the blower is operating at its correct speed before allowing gas flow to the ignition control module, preventing burner operation without adequate airflow. The ignition control module manages the pre-purge sequence, ignition timing, flame sensing, and the switching of the gas valves. Once the pilot flame is established and sensed by the flame rod, the main gas valve opens, allowing the main burner to ignite. A flame signal, measured in DC micro amps, confirms the presence of a stable flame. If the pilot fails to ignite or the flame is lost during operation, the ignition control module will shut off the automatic safety shut-off valves and lock out, requiring a manual reset.

The burner's piping system includes a main manual shut-off valve, a redundant gas valve, and a pilot regulator, all working together to control gas flow and pressure to the pilot and main burner. A sediment trap is also included to prevent debris from entering the gas train. The combustion chamber is designed to protect non-heat transfer surfaces and create a radiant bed for efficient heat transfer. The burner tube or stainless steel sleeve must be sealed airtight into the combustion chamber opening, ensuring proper air delivery and preventing premature deterioration of internal components.

Usage Features:

Automatic Ignition: The burner features automatic ignition, simplifying startup. Users are instructed to set the operating control or thermostat to call for heat, and the burner will initiate its pre-purge and ignition sequence.
Safety Lockout: In the event of ignition failure or flame loss, the system automatically locks out, requiring a manual reset by de-energizing the control. This prevents the accumulation of unburnt gas.
Pilot Gas Pressure Adjustment: The pilot gas pressure can be adjusted to optimize the flame signal, ensuring reliable flame detection by the ignition control module. This adjustment is performed via a screw on the pilot regulator.
Combustion Air Shutter Adjustment: The combustion air shutter can be adjusted to fine-tune the air-to-gas mixture for optimal combustion, as determined by flue gas analysis.
Manual Shut-Off: Manual shut-off valves for both the main gas and pilot lines are provided, allowing for complete isolation of the gas supply for service or extended periods of non-use.
Overheating Protection: In case of appliance overheating, users are instructed to shut off the manual gas control to the appliance but not the electrical supply to the blower, allowing the blower to continue running.
Diagnostic Information: The manual includes a trouble chart to assist in diagnosing common issues, guiding users or technicians through electrical and flame checks.

Maintenance Features:

Regular Inspection: The manual emphasizes the importance of regular inspection of the combustion chamber, heat exchanger, and flue connections for tars, scale, dirt, and soot. Joints should be checked for leaks.
Pilot System Check: The spark electrode assembly and flame sensing rod should be inspected for damage or displacement. The pilot air tubing must be kept free of kinks or obstructions to ensure proper airflow.
Blower Wheel Cleaning: Cleaning of the blower wheel is identified as a common service requirement, indicated by a deficiency of air in the flame. Motor cooling air vents should also be cleaned.
Electrical System Verification: Prior to service, all wires should be labeled, and proper operation verified after servicing to prevent dangerous conditions due to wiring errors.
Gas Leak Detection: A weak liquid soap solution is recommended for detecting gas leaks in piping and valves.
Purging Procedure: A specific procedure for purging air from the gas supply line and accumulated gases from the utilization equipment and chimney is provided, which is crucial for safe first light-off and after repeated unsuccessful ignition attempts.
Component Replacement: The manual advises using only MIDCO specified and approved parts for additions, changes, conversions, and service, and recommends that such work be performed by an authorized MIDCO representative, service agency, or fuel supplier.
Safety Device Checks: The pressure relief safety valve on boilers should be checked for good operating condition. The air pressure switch and limit controls should also be verified for proper operation.
Documentation: Installers are required to fill out an "Installation Adjustment Data Tag" and affix it to the burner or gas utilization equipment, providing a record of installation settings. The manual itself should be affixed adjacent to the burner for future reference.